SleekIdentity’s DUEL Savings Bank lets you battle it out to see who can save more. Put your coins in and let simple physics determine the winner. It uses a dry erase marker so you can label the white porcelain on the competing sides with whatever you want. I’d go with something like beer/food and I don’t have to tell you how that’s going to play out. Boy am I hungry. The red silicone band around it comes off to take the money out (or to shift some coinage to the other side, you cheater).